B Series Truck 2WD L4-2184cc 2.2L 2200 2-bbl (1990)
Positive Crankcase Ventilation Valve: Description and Operation
Carbureted
Positive Crankcase Ventilation System (PCV)
The PCV valve is operated by intake manifold vacuum. When the engine is running at idle, the PCV valve is opened slightly and a small amount of
blow-by gas is drawn into the engine. At higher engine speeds, the PCV valve is further opened and a larger amount of blow-by gas is drawn into the
engine.